Which specific lines of code need to be replaced when switching to a mailer class like Swiftmailer or PHPMailer in PHP?

When switching to a mailer class like Swiftmailer or PHPMailer in PHP, the specific lines of code that need to be replaced are the ones responsible for sending emails. This includes functions or methods that set up the email headers, body, recipients, and actually send the email. By replacing these lines with the appropriate methods provided by the chosen mailer class, you can ensure that your emails are sent using the new mailer. 

// Old way of sending emails using PHP's built-in mail function
$to = 'recipient@example.com';
$subject = 'Subject';
$message = 'Email content';
$headers = 'From: sender@example.com';

mail($to, $subject, $message, $headers);
```

```php
// New way of sending emails using Swiftmailer
require_once 'path/to/vendor/autoload.php';

// Create the Transport
$transport = (new Swift_SmtpTransport('smtp.example.org', 25))
  ->setUsername('your username')
  ->setPassword('your password');

// Create the Mailer using your created Transport
$mailer = new Swift_Mailer($transport);

// Create a message
$message = (new Swift_Message('Subject'))
  ->setFrom(['sender@example.com' => 'Sender Name'])
  ->setTo(['recipient@example.com' => 'Recipient Name'])
  ->setBody('Email content');

// Send the message
$result = $mailer->send($message);

Keywords

Swiftmailer PHPMailer mailer class code replacement PHP.

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